{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2021-47282", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-21T13:27:52.128Z", "datePublished": "2024-05-21T14:20:08.155Z", "dateUpdated": "2025-05-04T07:07:50.557Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T07:07:50.557Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: bcm2835: Fix out-of-bounds access with more than 4 slaves\n\nCommit 571e31fa60b3 (\"spi: bcm2835: Cache CS register value for\n->prepare_message()\") limited the number of slaves to 3 at compile-time.\nThe limitation was necessitated by a statically-sized array prepare_cs[]\nin the driver private data which contains a per-slave register value.\n\nThe commit sought to enforce the limitation at run-time by setting the\ncontroller's num_chipselect to 3: Slaves with a higher chipselect are\nrejected by spi_add_device().\n\nHowever the commit neglected that num_chipselect only limits the number\nof *native* chipselects. 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If GPIO chipselects are specified in the\ndevice tree for more than 3 slaves, num_chipselect is silently raised by\nof_spi_get_gpio_numbers() and the result are out-of-bounds accesses to\nthe statically-sized array prepare_cs[].\n\nAs a bandaid fix which is backportable to stable, raise the number of\nallowed slaves to 24 (which \"ought to be enough for anybody\"), enforce\nthe limitation on slave ->setup and revert num_chipselect to 3 (which is\nthe number of native chipselects supported by the controller).\nAn upcoming for-next commit will allow an arbitrary number of slaves."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: spi: bcm2835: corrige el acceso fuera de los l\u00edmites con m\u00e1s de 4 esclavos. La confirmaci\u00f3n 571e31fa60b3 (\"spi: bcm2835: valor de registro CS de cach\u00e9 para ->prepare_message()\") limit\u00f3 el n\u00famero de esclavos a 3 en tiempo de compilaci\u00f3n. La limitaci\u00f3n fue necesaria por una matriz de tama\u00f1o est\u00e1tico prepare_cs[] en los datos privados del controlador que contiene un valor de registro por esclavo. La confirmaci\u00f3n buscaba hacer cumplir la limitaci\u00f3n en tiempo de ejecuci\u00f3n estableciendo num_chipselect del controlador en 3: spi_add_device() rechaza los esclavos con una selecci\u00f3n de chip m\u00e1s alta. Sin embargo, la confirmaci\u00f3n omiti\u00f3 que num_chipselect solo limita el n\u00famero de selecciones de chips *nativas*. Si se especifican selecciones de chips GPIO en el \u00e1rbol de dispositivos para m\u00e1s de 3 esclavos, of_spi_get_gpio_numbers() genera silenciosamente num_chipselect y el resultado son accesos fuera de los l\u00edmites a la matriz de tama\u00f1o est\u00e1tico prepare_cs[]. Como soluci\u00f3n curita que se puede volver a transferir a estable, aumente la cantidad de esclavos permitidos a 24 (lo que \"deber\u00eda ser suficiente para cualquiera\"), aplique la limitaci\u00f3n en esclavo -> configuraci\u00f3n y revierta num_chipselect a 3 (que es la cantidad de nativos selecciones de chips admitidas por el controlador). Una pr\u00f3xima confirmaci\u00f3n para la pr\u00f3xima permitir\u00e1 una cantidad arbitraria de esclavos."}], "id": "CVE-2021-47282", "lastModified": "2025-04-30T14:30:12.573", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-05-21T15:15:16.430", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/01415ff85a24308059e06ca3e97fd7bf75648690"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/13817d466eb8713a1ffd254f537402f091d48444"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/82a8ffba54d31e97582051cb56ba1f988018681e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b5502580cf958b094f3b69dfe4eece90eae01fbc"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/01415ff85a24308059e06ca3e97fd7bf75648690"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/13817d466eb8713a1ffd254f537402f091d48444"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/82a8ffba54d31e97582051cb56ba1f988018681e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b5502580cf958b094f3b69dfe4eece90eae01fbc"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: spi: bcm2835: Fix out-of-bounds access with more than 4 slaves", "id": "2282515", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282515"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nspi: bcm2835: Fix out-of-bounds access with more than 4 slaves\nCommit 571e31fa60b3 (\"spi: bcm2835: Cache CS register value for\n->prepare_message()\") limited the number of slaves to 3 at compile-time.\nThe limitation was necessitated by a statically-sized array prepare_cs[]\nin the driver private data which contains a per-slave register value.\nThe commit sought to enforce the limitation at run-time by setting the\ncontroller's num_chipselect to 3: Slaves with a higher chipselect are\nrejected by spi_add_device().\nHowever the commit neglected that num_chipselect only limits the number\nof *native* chipselects. If GPIO chipselects are specified in the\ndevice tree for more than 3 slaves, num_chipselect is silently raised by\nof_spi_get_gpio_numbers() and the result are out-of-bounds accesses to\nthe statically-sized array prepare_cs[].\nAs a bandaid fix which is backportable to stable, raise the number of\nallowed slaves to 24 (which \"ought to be enough for anybody\"), enforce\nthe limitation on slave ->setup and revert num_chipselect to 3 (which is\nthe number of native chipselects supported by the controller).\nAn upcoming for-next commit will allow an arbitrary number of slaves."], "name": "CVE-2021-47282", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47282\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47282\nhttps://lore.kernel.org/linux-cve-announce/2024052154-CVE-2021-47282-edd8@gregkh/T"], "threat_severity": "Moderate"}

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